there is no scope variable in Angular 2+.
In Angular 2+ there is NgModel which helps you with two way binding.
https://angular.io/api/forms/NgModel
To access value of text area in your component.
In html
<textarea class="form-control" [(NgModel)]=comment placeholder="Add Comment">
<input type="button" value="Add" (click)="AddComment()" />
In component:
comment:any="";
AddComment(){
console.log(this.comment);
}
Here comment var will always be mapped to inputs in textarea.
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